Dental cusp



l. HOMER DENTAL CUSP.

APPLXCATION FILED SEPT 20, :920.

Patented Feb. 1', 1921.

WITNESSES ATTORNEYS rh'lhiil l'l' (EFFECE.

JOSEPH HOMER, OF BOSTON, MASSACHUSETTS.

DENTAL GUSP.

Specification of Letters Patent.

Patented Feb. 1, 1921.

Application filed September 20, 1920. Serial No. 411,392.

To all whom it may concern Be it known that l, Josnrn Henna, a citizenof the United States, and a resident of Boston, in the county of Suffolkand State of Massachusetts, have invented a new and Improved DentalCusp, of which the following is a full, clear, and exact description.

This invention relates to improvements in dental cusps, and moreparticularly to cusps for crowns, bridge-work, and porcelain faced orother teeth, an object of the invention being to provide an improvedcusp in which relatively small spherical metal particles, such as BostonBalls, known as B. Bs, are employed, said B. Bs being soldered orotherwise secured in the cusp of the teeth or crown and preferablylocated under the metal of the crown so as to provide a hearing whichcan readily be shaped or shape itself to the proper cusp of masticatingsurface.

A further object is to provide an improved construction of crown whichreadily conforms itself to the cusp of the teeth and which reduces to aminimum the labor of properly shaping the outer portion of the crown andpermits of a certain compensation or variation in surface due to theaction of engaging teeth to give the proper cusp after the crown is inplace.

lVith these and other objects in view the invention consists in certainnovel features of construction, and combinations and arrangements ofparts as will be more fully hereinafter described and pointed out in theclaims.

In the accompanying drawings Figure 1 is an inverted plan viewillustrating a crown provided with my improvements.

Fig. 2 is a View in vertical longitudinal section on the line 2-2 ofFig. 1.

Fig. 3 is a view partly in elevation and partly in longitudinal sectionillustrating my invention applied to bridge-work.

Fig. d is a view in longitudinal section illustrating my invention asapplied to a porcelain or other faced tooth.

1 represents a crown which may be made of gold orany other materialordinarily employed in the making of crowns for teeth and in theconstruction of-crowns in connection with bridge'worlr.

l he crown 1 fits over the tooth 2 which is metal spheres which aresoldered or otherwise secured to the inner surface of the crown, but itis obvious that these metal spheres or shot as I term them, could be secured or held in various ways and I do not wish to limit myself to theexact manner of shaping and forming the shot, nor the manner of securingthem in place, but desire to cover broadly the idea of the provision ofindependent articles or particles located under the crown and betweenthe same and the tooth as I believe the provision of such shot willfacilitate the proper cusp formation to the crown and will result ingreat improvement in the work as over what has heretofore been done.

In Fig. 3 1 illustrate my invention as applied to a bridge, the cusp lofthe bridge constituting an outer metal covering under which the B. Bs orspherical particles are secured in solder or other metal 5 on thesupporting bar or bridge 6.

The cusp of the bridge is, of course, made to conform to the surfaces ofthe teeth which itrcplaces and the supporting crowns 7 at the ends ofthe bridge being likewise formed with my improved cusps.

In Fig. i 1 illustrate a tooth having porcelain facing 8 and a crown 9in which the B. BS or particles 10 are embedded in the metal 11 andlocated under the biting surface of the crown to aid the antagonizingcrown in more readily forming cusps.

It is, of course, to be understood thatwhile l have illustrated severalforms of crown, bridge, and tooth in which the cusp s are made havingthe spherical particles or B. Bs embedded therein, it is obvious thatthis idea of forming cusps can be carried out with almost any form ofartificial teeth or bridgework, andv hence I do not limit myself to theprecise details set forth, but consider myself at liberty to maize suchchanges and altcrations as fairly fall within the spirit and scope ofthe appended claims.

I claim:

1. AS a new article of manufacture, a

5 crown having independent balls located under the top of the crown.

2. As a new article of manufacture, a dental cusp comprising a pluralityof balls, and means for securing the balls together.

3. As a new article of manufacture, a dental cusp comprising an outermetal surface,

and a plurality of balls embedded in sup porting material under saidouter surface.

4. As a new article of manufacture, a

tooth crown, and shot located under the top of the crown.

5. As a new article of manufacture, a tooth crown, and shot locatedunder the top of the crown, said shot embedded in solder and securedthereby to the inner face of the crown.

6. As a new article of manufacture, a tooth crown, and balls associatedtherewith and located under the biting surface of the crown and adaptedto aid the antagonizing crown in forming cusps.

JOSEPH HOMER, D. D.

